class_docstr: Callable and iterable class for producing new test cases.
code: def __call__(self, *args, **kwargs):
      raise RuntimeError(
          "You appear to be running a parameterized test case "
          "without having inherited from parameterized."
          "ParameterizedTestCase. This is bad because none of "
          "your test cases are actually being run."
      )
  
imports: import collections
  import functools
  import re
  import types
  import uuid
  import six
label_desc: Use image node_id 2 for calling the _ParameterizedTestIter obj's underlying member method code with example usage: obj.__call__() without return types